Development of Water Hydraulic System

2016 ◽  
Vol 819 ◽  
pp. 596-600
Author(s):  
Mohd Noor Asril Saadun ◽  
Ahmad Anas Yusof ◽  
Mohd Syukran Ismail
Keyword(s):  
System Performance ◽  
Hydraulic System ◽  
Operation Time ◽  
Control Valve ◽  
Pressure Control ◽  
Effect Of Temperature ◽  
Maximum Pressure ◽  
Water Pump ◽  
Pressure Medium ◽  
Water Hydraulic

Common hydraulic system using hydraulic oil as their working medium but there is an application using water due to high accessibility and environmentally concern.Water hydraulic is an attractive technology to use water as the pressure medium in hydraulic system. In this paper, water hydraulic system is design and develops that capable to use water as pressure medium. Water is used to provide clean environment and safe for the mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. Some of water challenged as the pressure medium in hydraulic system were considered during build and design the system to minimize the bad effect of water in hydraulic system. Besides, the arrangement of hydraulic components on the test rig also considered to optimize the water hydraulic system performance. Water hydraulic system performance was analyzed by measured maximum pressure produced from water pump and system efficiency. Others, the effect of temperature increment in water hydraulic system also analyzed to optimize operation time.

Effect of Parameter on Characteristics of Active Charge Accumulator for Water Hydraulic System

2015 ◽  
Author(s):  
Futoshi Yoshida ◽  
Kenji Ito ◽  
Shouichiro Iio ◽  
Ato Kitagawa
Keyword(s):  
Hydraulic System ◽  
Basic Characteristic ◽  
Experimental Approach ◽  
Control Valve ◽  
Pressure Change ◽  
Pressure Control ◽  
Output Flow ◽  
Water Hydraulic ◽  
Pressure Control Valve ◽  
Piston Stroke

Active Charge Accumulator (ACA) is a new pressure convert technology which does not require any pressure control valve. ACA can be easily reduce or boost the pressure in water hydraulic system by using a multistage piston and on-off valves. This paper was focused on the basic characteristic of ACA especially for decompression process. The both of experimental approach and theoretical one were conducted. As the experimental results, it is revealed that the piston stroke of ACA strongly depends on the output flow rate and switching timing of the on-off valves. Analytical model of ACA was made and validated. As a result, it can be revealed influence of parameters on characteristics of ACA. The pressure change in the system was well estimated by the model.

Microbial water quality and diversity in hydraulic systems using tap water as a pressure medium

2000 ◽  
Vol 41 (12) ◽  
pp. 215-222 ◽  
Author(s):  
S. M. Soini ◽  
K. T. Koskinen ◽  
M. Vilenius ◽  
J. A. Puhakka
Keyword(s):  
Hydraulic System ◽  
Tap Water ◽  
Pilot Scale ◽  
Hydraulic Systems ◽  
Water Hydraulics ◽  
Pressure Medium ◽  
Viable Bacteria ◽  
Water Hydraulic ◽  
Cell Densities

Water hydraulics uses tap water or demineralised water as a pressure medium and has fewer environmental impacts than oil-using hydraulics. The applicability is restricted by the microbial quality of the medium. The objectives of this study were to determine whether microbes grow in the pressure medium of a water hydraulic system, biofilm is formed on the surfaces and to describe the diversity of bacteria that survive and grow in water hydraulic systems. A pilot-scale water hydraulic system was used in the experiments. The viable counts in the pressure medium increased in three days from 102 to 3 ×104 cfu/ml followed by a gradual decrease towards the steady-state concentration of 6× 1034 cfu/ml. The total cell numbers decreased from 3×105 to 2 ×104 cells/ml during the three weeks of operation indicating attachment onto the system surfaces as biofilms. The biofilm cell densities on collector slide surfaces varied between 7 ×103 and 1.2 ×104 cells/cm2 after 21 days of operation. The phosphatase activity in the pressure medium was in conformity with the numbers of viable bacteria. The enzymatic activities (α- and β- glucosidase, phosphatase, aminopeptidase) varied between 0.4 and 300 nmol/lh. The diversity of bacteria growing in the system was wide and differed from that of tap water.

Development and Analysis of Small Scale Water Accumulator by Using Piston Type

2015 ◽  
Vol 761 ◽  
pp. 191-195
Author(s):  
Mohd Noor Asril Saadun ◽  
Ahmad Anas Yusof ◽  
Muhammad Ismail Zakaria
Keyword(s):  
Hydraulic System ◽  
Environmental Concern ◽  
Control Valve ◽  
Pressure Control ◽  
Small Scale ◽  
Auxiliary Component ◽  
Hydraulic Hybrid ◽  
Directional Control ◽  
Weighing Method ◽  
Pressure Control Valve

An accumulator is an auxiliary component in a hydraulic system as it stores the energy and avoids the pump from running continuously through the system which can reduce the pumps life. The accumulator is also used as the power source in the hydraulic hybrid system to accelerate the vehicle. A common hydraulic system uses the hydraulic oil as their working medium, but there is an application using water due to the high accessibility and environmental concern. In this paper, an accumulator is developed by using weighing method to increase the pressure in the system. This system uses water as a medium to provide clean environment as well as safe for mobile purpose. The system includes electric motor, water pump, directional control valve, pressure control valve and motor hydraulic. The performance of the accumulator is obtained by measuring the ratio of output and input pressure. The source of electricity is varied by using an inverter to control the frequency and the power of the pump. From the experiment, the pressure output and flow rate decreased with the increasing of the loads on top of the accumulator, while the pressure loss increased with the number of load. The operational frequency is optimal at a low reading compared to a higher frequency.

Comprehensive discussions on higher back pressure system performance with cavitation suppression using high back pressure

2018 ◽  
Vol 233 (7) ◽  
pp. 2442-2455
Author(s):  
L Lu ◽  
X Fu ◽  
S Ryu ◽  
YB Yin ◽  
ZX Shen
Keyword(s):  
System Performance ◽  
Hydraulic System ◽  
Pressure Fluctuations ◽  
Normal Pressure ◽  
Pressure Control ◽  
Mechanical Efficiency ◽  
Back Pressure ◽  
Chamber Pressure ◽  
Pump Efficiency ◽  
Pressure System

As a stubborn problem of hydraulic technology, cavitation occurs in nearly every hydraulic system and causes serious associated problems. Many anti-cavitation component improvements have been done, leading to complex structures and higher manufacturing costs. Synchronously increasing the outlet or back pressure of the pump, valve and actuator may be the most straightforward way to eliminate cavitation for the entire hydraulic system. A higher back pressure system may also induces side-effects, so comprehensive discussions on higher back pressure system performance were presented in this paper. It was found that a higher back pressure system shows good effects on weakening pump outlet/inlet pressure fluctuations, shell vibration, and noise. Furthermore, simulation visualization showed consistent results for pump cavitation reduction, while with limited effects on higher back pressure conditions. With regard to pump efficiency, the higher back pressure system showed no change in the volumetric efficiency with higher back pressure, improved cavitation loss, but increased pump leakage. The mechanical efficiency rarely changed, and the detailed mechanism was much more complex. These results occurred because the higher piston chamber pressure with higher back pressure simultaneously changed the normal pressure and the lubrication property of the pump pairs. However, the system energy budget was optimistic, since considerable pressure loss from valve cavitation was prevented, although the back pressure control slippage pump added greater energy input to the system.

A Miniature On/Off Valve Concept for High Performance Water Hydraulics

2017 ◽  
Author(s):  
Miika Paloniitty ◽  
Matti Linjama
Keyword(s):  
High Performance ◽  
Control Valve ◽  
Hydraulic Control ◽  
Used Oil ◽  
Water Hydraulics ◽  
Starting Point ◽  
Pressure Medium ◽  
Water Hydraulic ◽  
Valve Control ◽  
Hydraulic Valve

Digital hydraulic control valve technology has shown its strengths in providing reliable, leak-tight and high performance valve control regardless of the pressure medium used, oil or water. This is enabled by the intelligent use of robust on/off seat valves. However, the availability of these valves for water hydraulics is limited, especially that of compact valves, which are needed for digital valve systems. Thus, with the aim to create a compact digital water hydraulic valve system, this paper presents the development process of a water hydraulic miniature valve. The starting point for the development is a previously developed miniature valve for oil hydraulics. Experimental results with the new prototype show that good performance can be achieved for the miniature valve even with using stainless steel materials. This enables high-performance digital water hydraulic control.

scholarly journals FUNCTIONS, FUNCTIONING AND OPTIMIZED POSITIONING OF PRESSURE CONTROL VALVES IN OIL-HYDRAULIC CIRCUITS

2006 ◽  
Vol 5 (2) ◽  
pp. 42
Author(s):  
M. N. E. Reis ◽  
S. G. Tavares ◽  
C. B. Soares ◽  
J. A. Soares ◽  
R. H. R. Antunes ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Safety Valve ◽  
Pressure Control ◽  
Basic Function ◽  
Maximum Pressure ◽  
Hydraulic Systems ◽  
Control Valves ◽  
Control Devices ◽  
Different Levels ◽  
Hydraulic Circuits

The pressure control valves can perform different functions in the hydraulic systems, such as: establish maximum pressure, reduce pressure in some circuit lines, and establish sequence movements, among other functions. The main operation of these valves consists of providing a balance between pressure and the force load on a spring. Most of these valves can be positioned in many different levels, between totally open and totally closed, depending on the flow and on the pressure differential. The pressure control valves are usually named according to their primary functions, e.g., lock wire valve, sequence valve, safety valve, etc. and, their basic function is limit or to determine the pressure of the hydraulic system for the attainment of a certain function of the equipment in motion. They are also classified by the type of connections, by the size and by the selected pressure band. Instead of relief and security, discharge, counterbalance, sequence, reducing and shock suppressor valves represent the pressure control devices. In this paper, oil-hydraulic circuits are suggested for practical lessons of Hydraulic and Pneumatic Commands where they regulate valves of pressure, by acting in the following situations: limiting the maximum pressure of the system, determining a level of pressure, determining two different levels of pressure, determining at the same time two distinct levels of pressure, unloading the pump. The functions of these devices will be discussed and analyzed as an attempt to improve their position in the circuit.

scholarly journals VALVE SELECTION FOR THE PURPOSE OF REDUCING THE WATER HAMMER EFFECT IN A PRESSURIZED PIPELINE

2019 ◽  
pp. 217
Author(s):  
Milica Nikodijevic ◽  
Živojin Stamenković ◽  
Jelena Petrović ◽  
Miloš Kocić
Keyword(s):  
Hydraulic System ◽  
Pressure Rise ◽  
Control Valve ◽  
Water Hammer ◽  
Maximum Pressure ◽  
Transient Regimes ◽  
Butterfly Needle ◽  
Efficient Protection ◽  
Selection For ◽  
Water Hammer Effect

This paper discusses the gravity-fed hydraulic system, which consists of the upper reservoir, the lower reservoir, the pipeline, and valves. To achieve simpler and more efficient protection of a system against water hammer, it is advisable to establish conditions in which the pressure rises as little as possible during transient regimes without using any protective equipment. The discussion focuses on the pressure rise caused by different valve types: butterfly, needle, and ball valves, as well as two valve closure intervals – 20 and 40 seconds. The systems considered have nominal diameters of DN 300 and DN 600. The problem was studied using a simulation of unsteady flow regimes of hydraulic transport. The obtained results regarding the maximum pressure rise due to water hammer were used to select the most satisfactory control valve for the considered hydraulic system.

Proportional Pressure Control of Water Hydraulic System for Water-Assisted Injection Molding: Modeling and Simulation

2008 ◽  
Author(s):  
Zengmeng Zhang ◽  
Hua Zhou
Keyword(s):  
Injection Molding ◽  
Modeling And Simulation ◽  
Hydraulic System ◽  
Closed Loop ◽  
Injection Pressure ◽  
Pressure Control ◽  
Closed Loop Control ◽  
Load Characteristic ◽  
Loop Control ◽  
Water Hydraulic

The proportional pressure control of water hydraulic system for water-assisted injection molding (WAIM) is investigated through modeling and simulation. WAIM is an innovative process to mold plastic parts with hollow sections. A water hydraulic system is designed for WAIM and a differential pressure control strategy is provided to regulate the water injection pressure by a proportional relief valve. An accumulator and a pressure cylinder are applied in the system and modeled in MATLAB. The load characteristic is analyzed and the coupling relationship between load pressure and flow rate is approximately simulated. Based on the variable-parameter model with linearization, open-loop and closed-loop control with multi-point feedback are investigated. Integral compensation and PI control are used with slope control of injection pressure. In addition, the influence of load characteristic is also investigated. Results of the simulation show that the closed-loop control contributes to the stability and disturbance resistance performance under various load characteristics.

scholarly journals Static Characteristics of Pressure Control Valve

2017 ◽  
Vol 67 (1) ◽  
pp. 119-124
Author(s):  
Ondřej Vykoukal ◽  
Lumír Hružík ◽  
Adam Bureček
Keyword(s):  
Experimental Measurement ◽  
Hydraulic System ◽  
Check Valve ◽  
Control Valve ◽  
Pressure Control ◽  
Static Characteristics ◽  
Hydraulic Pump ◽  
Relief Valve ◽  
Pressure Control Valve

Abstract The article deals with the measurement of static characteristics of a pressure control valve. The pressure, at which the valve starts to leak oil, is adjusted by a spring. The measurement is performed on a hydraulic system that consists of tank, hydraulic pump, check valve, relief valve and pressure control valve which is measured. The results of this experimental measurement are Δp - Q characteristics of the pressure control valve for various pressure settings.

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